[Bug]: Unable to build from a Dockerfile loaded from the classpath of a Jar.

Module

Core

Testcontainers version

1.20.2

Using the latest Testcontainers version?

Yes

Host OS

Linux

Host Arch

x86

Docker version

[jamesm@wt1devps05 solana4j]$ docker --version
Docker version 26.1.4, build 5650f9b

What happened?

Unable to build from a Dockerfile read from a Jar.

In fact, loading files from the classpath from jars in general looks a bit broken to me. I raised an issue a few days ago that became unwieldy, so I tried to recreate the issue in as simple a way as possible. That previous issue I closed.

I have created a unit test that proves the problem. Just apply the patch in the "Additional Information" section.

Question I have simply is am I doing something wrong, or is this indeed a bug, or is this simply not supported? It certainly looks like the code is trying quite hard to support what I'm trying to do.

I'd be happy to devote some time to raise a PR if you agree that this is not expected behaviour.

Thanks.

Relevant log output

Caused by: com.github.dockerjava.api.exception.DockerClientException: Failed to read build context directory: /tmp
at org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.addFilesInDirectory(Dockerfile.java:201)
at org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.addFilesInDirectory(Dockerfile.java:207)
at org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.(Dockerfile.java:186)
at org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile.parse(Dockerfile.java:111)
at org.testcontainers.shaded.com.github.dockerjava.core.command.BuildImageCmdImpl.withDockerfile(BuildImageCmdImpl.java:344)
at org.testcontainers.shaded.com.github.dockerjava.core.command.BuildImageCmdImpl.withDockerfile(BuildImageCmdImpl.java:22)
at org.testcontainers.images.builder.ImageFromDockerfile.lambda$configure$0(ImageFromDockerfile.java:177)
at java.base/java.util.Optional.ifPresent(Optional.java:178)
at org.testcontainers.images.builder.ImageFromDockerfile.configure(ImageFromDockerfile.java:176)
at org.testcontainers.images.builder.ImageFromDockerfile.resolve(ImageFromDockerfile.java:124)
at org.testcontainers.images.builder.ImageFromDockerfile.resolve(ImageFromDockerfile.java:43)
at org.testcontainers.utility.LazyFuture.getResolvedValue(LazyFuture.java:20)
at org.testcontainers.utility.LazyFuture.get(LazyFuture.java:41)
at org.testcontainers.shaded.com.google.common.util.concurrent.Futures$1.get(Futures.java:538)
at org.testcontainers.images.RemoteDockerImage.getImageName(RemoteDockerImage.java:172)
at org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:76)
at org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:35)
at org.testcontainers.utility.LazyFuture.getResolvedValue(LazyFuture.java:20)
at org.testcontainers.utility.LazyFuture.get(LazyFuture.java:41)
at org.testcontainers.containers.GenericContainer.getDockerImageName(GenericContainer.java:1354)
... 54 more

Failed to read build context directory: /tmp
com.github.dockerjava.api.exception.DockerClientException: Failed to read build context directory: /tmp
at app//org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.addFilesInDirectory(Dockerfile.java:201)
at app//org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.addFilesInDirectory(Dockerfile.java:207)
at app//org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile$ScannedResult.(Dockerfile.java:186)
at app//org.testcontainers.shaded.com.github.dockerjava.core.dockerfile.Dockerfile.parse(Dockerfile.java:111)
at app//org.testcontainers.shaded.com.github.dockerjava.core.command.BuildImageCmdImpl.withDockerfile(BuildImageCmdImpl.java:344)
at app//org.testcontainers.shaded.com.github.dockerjava.core.command.BuildImageCmdImpl.withDockerfile(BuildImageCmdImpl.java:22)
at app//org.testcontainers.images.builder.ImageFromDockerfile.lambda$configure$0(ImageFromDockerfile.java:177)
at java.base@17.0.11/java.util.Optional.ifPresent(Optional.java:178)
at app//org.testcontainers.images.builder.ImageFromDockerfile.configure(ImageFromDockerfile.java:176)
at app//org.testcontainers.images.builder.ImageFromDockerfile.resolve(ImageFromDockerfile.java:124)
at app//org.testcontainers.images.builder.ImageFromDockerfile.resolve(ImageFromDockerfile.java:43)
at app//org.testcontainers.utility.LazyFuture.getResolvedValue(LazyFuture.java:20)
at app//org.testcontainers.utility.LazyFuture.get(LazyFuture.java:41)
at app//org.testcontainers.shaded.com.google.common.util.concurrent.Futures$1.get(Futures.java:538)
at app//org.testcontainers.images.RemoteDockerImage.getImageName(RemoteDockerImage.java:172)
at app//org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:76)
at app//org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:35)
at app//org.testcontainers.utility.LazyFuture.getResolvedValue(LazyFuture.java:20)
at app//org.testcontainers.utility.LazyFuture.get(LazyFuture.java:41)
at app//org.testcontainers.containers.GenericContainer.getDockerImageName(GenericContainer.java:1354)
at app//org.testcontainers.containers.GenericContainer.doStart(GenericContainer.java:351)
at app//org.testcontainers.containers.GenericContainer.start(GenericContainer.java:322)
at app//org.testcontainers.images.builder.DockerfileBuildTest.performTest(DockerfileBuildTest.java:96)
at java.base@17.0.11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base@17.0.11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base@17.0.11/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base@17.0.11/java.lang.reflect.Method.invoke(Method.java:568)
at app//org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at app//org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at app//org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at app//org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at app//org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at app//org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at app//org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at app//org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at app//org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at app//org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at app//org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at app//org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at app//org.junit.runners.Suite.runChild(Suite.java:128)
at app//org.junit.runners.Suite.runChild(Suite.java:27)
at app//org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at app//org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at app//org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at app//org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at app//org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at app//org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:112)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:60)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
at java.base@17.0.11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base@17.0.11/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base@17.0.11/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base@17.0.11/java.lang.reflect.Method.invoke(Method.java:568)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at jdk.proxy1/jdk.proxy1.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

Additional Information

Index: core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java b/core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java
--- a/core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java	(revision cd29df97aa06e744ed4d8c17ca33b7983ef7f338)
+++ b/core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java	(date 1729547678601)
@@ -5,6 +5,7 @@
 import org.junit.runners.Parameterized;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.startupcheck.OneShotStartupCheckStrategy;
+import org.testcontainers.utility.MountableFile;
 
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -70,6 +71,13 @@
                     .withFileFromPath(".", RESOURCE_PATH)
                     .withDockerfile(RESOURCE_PATH.resolve("Dockerfile-alt")),
             },
+            // Dockerfile build using dockerfile from resources
+            new Object[]{
+                "test4567",
+                new ImageFromDockerfile().withDockerfile(
+                        Paths.get(MountableFile.forClasspathResource("/recursive/Dockerfile").getFilesystemPath())
+                    ),
+            },
         };
     }
 
Index: core/testlib/recursive/Dockerfile
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/core/testlib/recursive/Dockerfile b/core/testlib/recursive/Dockerfile
new file mode 100644
--- /dev/null	(date 1729547092581)
+++ b/core/testlib/recursive/Dockerfile	(date 1729547092581)
@@ -0,0 +1,1 @@
+FROM postgres

Run core/testlib/create_fakejar.sh and then run the test in the above patch, should replicate the issue.

Start with core/src/test/java/org/testcontainers/images/builder/DockerfileBuildTest.java and the MountableFile.forClasspathResource call shown in the report. Run the Dockerfile build test using the classpath resource packaged in a Jar, then confirm that the build context is read successfully without the reported failure.